Core form



FIG. 1 is a perspective view of a core form showing an eighth embodiment of my new design;

FIG. 2 is a front elevation view of FIG. 1;

FIG. 3 is a back elevation view of FIG. 1;

FIG. 4 is a left side elevation view of FIG. 1;

FIG. 5 is a right side elevation view of FIG. 1;

FIG. 6 is a bottom plan view of FIG. 1; and,

FIG. 7 is a top plan view of FIG. 1. 

The ornamental design for core form, as shown and described. 